Q1
What do stars form from?
ANebulae (gas and dust clouds)
BOnly rock
COnly water
DOnly metal
SSCClass 8 (SSC)Science (सामान्य विज्ञान)Ch 19 · Topic 1
Life Cycle of Stars
Stars go through a life cycle from formation to eventual death, with their mass determining their fate as white dwarfs, neutron stars, or bl
Core concept
Stars form from clouds of gas and dust called nebulae, which collapse under gravity, eventually igniting nuclear fusion to become a star.
How it works
During most of a star's life (main sequence), it fuses hydrogen into helium, releasing enormous energy that powers its light and heat.
Why it matters
When a star like our Sun exhausts its fuel, it expands into a red giant, then eventually sheds its outer layers, leaving behind a white dwarf.
Key detail
Massive stars end more dramatically in supernovae explosions, potentially leaving behind neutron stars or, for the most massive stars, black holes.
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Quick notes
• Stars form from nebulae (gas, dust clouds).
• Gravity collapse ignites nuclear fusion.
• Main sequence: fuses hydrogen into helium.
• This powers the star's light, heat.
• Sun-like stars: expand to red giant.
• Then shed layers, become white dwarf.
• Massive stars: end in supernova explosions.
• May leave neutron stars or black holes.